• SQL Server分页大全及效率分析


    1.分页方案一:(利用Not In和SELECT TOP分页)


    语句形式:
    SELECT TOP 10 *
    FROM TestTable
    WHERE (ID NOT IN
    (SELECT TOP 20 id
    FROM TestTable
    ORDER BY id))
    ORDER BY ID


    SELECT TOP 页大小 *
    FROM TestTable
    WHERE (ID NOT IN
    (SELECT TOP 页大小*页数 id
    FROM 表
    ORDER BY id))
    ORDER BY ID

    2.分页方案二:(利用ID大于多少和SELECT TOP分页)

    语句形式:
    SELECT TOP 10 *
    FROM TestTable
    WHERE (ID >
    (SELECT MAX(id)
    FROM (SELECT TOP 20 id
    FROM TestTable
    ORDER BY id) AS T))
    ORDER BY ID


    SELECT TOP 页大小 *
    FROM TestTable
    WHERE (ID > (SELECT MAX(id)
    FROM (SELECT TOP 页大小*页数 id
    FROM 表
    ORDER BY id) AS T))
    ORDER BY ID


    3.分页方案三:(利用SQL的游标存储过程分页)

    createprocedure SqlPager
    @sqlstr nvarchar(4000), --查询字符串
    @currentpage int, --第N页
    @pagesize int --每页行数
    as
    set nocount on
    declare @P1 int, --P1是游标的id
    @rowcount int
    exec sp_cursoropen @P1 output,@sqlstr,@scrollopt=1,@ccopt=1,@rowcount=@rowcount output
    select ceiling(1.0*@rowcount/@pagesize) as 总页数--,@rowcount as 总行数,@currentpage as 当前页
    set @currentpage=(@currentpage-1)*@pagesize+1
    exec sp_cursorfetch @P1,16,@currentpage,@pagesize
    exec sp_cursorclose @P1
    set nocount off

    其它的方案:如果没有主键,可以用临时表,也可以用方案三做,但是效率会低。
    建议优化的时候,加上主键和索引,查询效率会提高。

    通过SQL 查询分析器,显示比较:我的结论是:
    分页方案二:(利用ID大于多少和SELECT TOP分页)效率最高,需要拼接SQL语句
    分页方案一:(利用Not In和SELECT TOP分页) 效率次之,需要拼接SQL语句
    分页方案三:(利用SQL的游标存储过程分页)效率最差,但是最为通用

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  • 原文地址:https://www.cnblogs.com/kingboy2008/p/2055548.html
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